/**
 *    Copyright (C) 2025-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
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 *    it in the license file.
 */

#include "mongo/db/query/compiler/optimizer/cost_based_ranker/ce_cache.h"

namespace mongo::cost_based_ranker {

template <bool EnableLogging>
CECache<EnableLogging>::CECache() {
    if constexpr (EnableLogging) {
        _logStream << std::fixed << std::setprecision(2);
    }
}

template <bool EnableLogging>
CECache<EnableLogging>::~CECache() {
    if constexpr (EnableLogging) {
        auto hits = _meHits + _ibHits;
        auto misses = _meMisses + _ibMisses;
        double cacheHitRatio =
            misses > 0 ? static_cast<double>(hits) / static_cast<double>(misses) : 0;
        log("CECache summary: ",
            "[MatchExpressions] cached: ",
            _exprCache.size(),
            ", hits: ",
            _meHits,
            ", misses: ",
            _meMisses,
            "; [IntervalBounds] cached: ",
            _intervalCache.size(),
            ", hits: ",
            _ibHits,
            ", misses: ",
            _ibMisses,
            "; [Total] hits: ",
            hits,
            ", misses: ",
            misses,
            "; Cache hit ratio: ",
            cacheHitRatio);
        std::cout << _logStream.str() << std::endl;
    }
}

// Explicit instantiation definitions
template class CECache<true>;
template class CECache<false>;
}  // namespace mongo::cost_based_ranker
